For wtv reason on nixos importing `pyqtgraph` first is causing `numpy`
to fail import?? No idea, but likely something to do with recent
`flake.nix`'s ld-lib-linking with `<nixpkgs>` marlarky?
Buncha updates and improvements,
- adjust sub-namespace imports according to console warnings.
- iterate all detected screens in a loop and instead report which is the
primary and the current.
- type annotate all vars where non-obvious, particularly the`Qt` refs.
Tyler Goodlet